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Profit Appropriation and Restricted Net Assets - Additional Information (Details)
12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Profit Appropriation and Restricted Net Assets [Line Items]      
Allocation of after-tax profits to statutory surplus fund, percentage 10.00%    
Limit of statutory surplus fund as a percentage of registered capital, after which allocations to statutory surplus fund are no longer required 50.00%    
Non-distributable reserve funds ¥ 0 $ 0 ¥ 0
Variable Interest Entities      
Profit Appropriation and Restricted Net Assets [Line Items]      
General reserve fund of after-tax profits percentage 10.00%    
Amounts of restricted paid up capital and statutory reserve funds of PRC subsidiaries and net assets of VIEs ¥ 12,331,217 $ 1,793,501